Portable battery



FIG. 1 is a front elevation view of a portable battery showing my newdesign;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a front perspective view thereof.

In the drawings, the broken lines represent portions of the portablebattery which form no part of the claimed design.

CLAIM The ornamental design for a portable battery, as shown anddescribed.